I'm currently building a 3.0 USA SC with Waynes hot pick suggestions:
Keeping CIS
9.8:1 JE's
Elgin SC330 Cams (Step below 964's)
SSI's 2/1 sport muffler
Bore/Blended intake/runners ~37mm.
I was told this combination would cause lean running and possible detonation with leaving the CIS stock. Would replacing the fuel distrib. and WUR with the 81-83 Euro units help (as the Euro's also had 9.8:1)?
See thread for more detail:
http://forums.pelicanparts.com/showthread.php?threadid=113153